Elementary treatise on electricity and magnetism : (1905)
Foster, G. C. (George Carey), 1835-1919, Joubert, J. (Jules François), 1834-1910, Porter, Alfred W. (Alfred William), 1863-1939 · London ; New York ; Bombay : Longmans, Green, and Co. · leaf 424
ntmagnetic field at the common centre remains of constant magni-tude, but its direction rotates at a uniform rate. For if Hcosiotand ^ sin coif be the two fields at right angles, the resultant M isgiven by the square root of the sum of their squares (Fig. 285);that is, R= JH- sin2 wt + H^ cos2 (at=… … A HsinWt /Y Fig. 284. HcosCJt Fig. 285. > rif^ht angles to the resultant field. If this coil be held fixed, thelines of induction threading it will change in number as the fieldrotates, decreasing from a positive maximum, when the axis of thefield coincides with the axis of the coil, to zero…
Electricity · Magnetism
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